ES2253239T3 - AUTOMATIC CLOSING VALVE. - Google Patents

Abstract

The invention relates to a self-closing valve for the dispensing of flowable media from a container comprising a curved membrane, a support segment, a connecting wall as well as a slitting provided in said membrane.

Description

Automatic shut-off valve

The present invention relates to a valve automatic closure for the extraction of fluid media from a container.

There are numerous liquids and similar products to liquids sold to users in containers adequate.

Among these liquids are for example products for cleaning and caring for the human body, such as liquid soaps, shower gels, shampoos, skin oils and Many other products. Another group of this type of products is formed by foods and condiments, for example ketchup, mustard, honey and the like A third group of this type of products is constituted by liquids of common use, such as oils technicians, etc.

The products mentioned have in common that the user takes them out of the container in relatively quantities little.

To do this, conventional containers they have a cap screwed on a neck container. To remove the liquid, the container and the liquid comes out. There are numerous different configurations depending on the viscosity of the liquid and the intended use, by example containers with small extraction openings and elastic containers that are squeezed to remove the liquid.

In the patent literature there are numerous proposals to configure such a container closure with an automatic shut-off valve Such a valve has the advantage that the user does not have to loosen a cap every time you are going to take out liquid.

However, the requirements imposed on a closing Automatic are very strict. The closure must be activated by simple way, because otherwise it offers no advantage in front of conventional screw closures, and also has to have sufficient tightness for the intended use correspondent.

In the document EP-A-0 545 678 proposes a closure cap with an automatic closure in which it is used a convex membrane that is attached with a clamping edge to through a connecting wall. The connecting wall is arranged between the membrane and the clamping edge so that, to open the membrane unwinds and exerts on the membrane a force of opening that will cause the opening of the same.

Starting from the current state of the art, the The present invention aims to create a shut-off valve automatic with good opening properties and tightness, which requires little space, which can be arranged in a hood of simple configuration closure that can be manufactured Simple and economical

This objective is met according to the invention. by the object of claim 1.

The subclaims indicate advantageous improvements of the invention.

By means of the solution according to the invention, you get an automatic shut-off valve that opens reliably  when pressure is applied to the vessel in the position of extraction and that on the other hand closes reliably and hermetic

The valve according to the invention has a wall annular joint which is essentially arranged perpendicular to the longitudinal axis of the container closure or, in other words, which is essentially parallel to the plane in which it extends the closure membrane. Membrane mobility is achieved. through a hinge configuration between the wall intermediate and the side wall of the membrane, which produces a more or less flaccid flexural membrane suspension and with this prevents moments from the intermediate wall from being transmitted to the membrane and vice versa.

The invention provides a convex membrane whose convexity is oriented towards the inside of the container in the closing position If the container is pressed in position inverted, that is, with the valve facing down, inside the vessel overpressure occurs and the membrane bulges towards outside. This causes grooves to open in the membrane that allow the passage of the liquid.

The membrane and the grooves are adapted between yes so that, when the membrane deforms outward, in she accumulate elastic recoil forces that cause the valve closure when pressure is discharged.

Preferably, the membrane and the joint wall They are configured with rotation symmetry. In a form of embodiment of this type, the clamping section preferably It is also configured with rotation symmetry.

Preferably, the membrane is configured as so that in the resting position it presents approximately the Shape of a spherical segment. However, the expression "segment spherical "is only used here as a reference of the basic configuration and does not imply any geometric definition exact membrane shape.

The membrane is provided with grooves to be able to open it

In particular, in the case of a membrane with rotation symmetry four or five slots can be provided that extend respectively from the axis of rotation outward, is say, towards the junction wall.

According to a preferential improvement of the invention is provided a groove that extends through the axis of rotation in radial direction.

However, particularly preferably the membrane has three slots. In case of a configuration of membrane with rotation symmetry, these slots are arranged such that they extend from the axis of rotation in the direction radial out. Preferably, the slots present in each case the same angular distance from each other, this being 120º.

The use of three slots has advantages special.

The realization of three, four or five slots divide the membrane into a corresponding amount of lobes Finished in tip. After deformation and opening, these lobes have to go back in such a way that their cutting limits are lean against each other in the exact position. A slight disorientation of the lobes causes an overlap of the themselves, mainly in the area of their tips, which prevents a hermetic contact between the lobes.

This problem does not arise if it is used only a central groove, since in that case it is not formed no lobe of the type described above.

The especially preferred construction with three Slots is based on the knowledge that such a lobe which covers an angular sector of 120º is much better protected against lateral displacements and disorientation that a lobe that only covers 90 degrees or less.

According to another improvement especially preferred of the invention, which is suitable in case of  a slot, but preferably also in case of three, four, five or more slots, the slots are configured such that within them there is at least a bridge of material.

This or these bridges of material act within the elastic membrane as elastic traction springs and contract the slot when closing it again.

As will be explained later, through this configuration is achieved a closure that, despite requiring forces reduced opening, has high closing forces and originates safe guidance of the closing lobes so that they rest between yes with their respective side edges.

The membrane and the joint wall are decoupled in terms of moments, that is, forces and in particular the moments that the joint wall can transmit to the membrane influence as little as possible the movement of the membrane.

This is achieved through a union by way of hinge between the junction wall and the membrane. This hinge is Can manufacture in different ways. Especially preferably, in the junction zone between the junction wall and the membrane is arranged a thin area surrounding the membrane if This is configured with rotation symmetry. Preferably said thin zone is configured with a cross section in "S" shape to reinforce the hinge effect.

As described above, the area of transition between the junction wall and the membrane is configured such that in particular no moment is transmitted from the membrane binding wall. According to a configuration preferred, this transition zone can also be created by providing a heterogeneous material in said area, that is, for example using a different material or influencing the properties of  material in that area properly to achieve reduction Desired moment transmission capacity.

The valve according to the invention can be produced with any material that presents adequate values in terms of elastic deformation and elastic recoil force.

Especially preferably, the membrane and / or the joint wall are made of a silicone material. The membrane and / or the junction wall can also be produced with a thermoplastic elastomer. Preferably, the connecting wall, the clamping section and the membrane are of the same material and set up a valve body.

Especially preferably, the section of Self-closing valve clamp is reinforced by a plastic device, a plastic ring if the valve is configured with rotation symmetry, which, compared to the Union wall and membrane material, is produced with a more rigid plastic material and if necessary also more economic.

According to an embodiment preferably, in the clamping section an injection molded Reinforcement ring of a harder plastic. Preferably, the Reinforcement ring is produced in a previous manufacturing process regardless of the automatic shut-off valve and in this Reinforcement ring is provided numerous openings in which you can Enter the valve material during the molding process injection, so that an intimate union is formed, firm and also Economical between the reinforcement ring and the valve body.

Polyamide is preferably used as material for the reinforcement ring.

The injection process can be developed from such that the polyamide ring and the silicone membrane are inject consecutively as follows: first the polyamide is injected into the injection mold, to the injection mold is then opened and mounted with a different arrangement of the cavities, and then the silicone in these modified cavities. At the same time, in a second cavity, or in a certain amount of seconds cavities, if as preferred the injection is performed in several valves at the same time, in turn the material of polyamide for ring production.

This results in a first phase in which only polyamide rings are injected and then injected Rhythmic shape polyamide rings and at the same time silicone on the polyamide rings that have been injected in the phase above, so that in each case a rhythmically occurs finished valve or the total amount of finished valves that have been of injecting in one phase.

It should be noted that this procedure is not Limited to polyamide and silicone materials, but also It can be made with other materials, thermoplastic elastomers, etc.

For the concepts "fluid", "liquids" and "medium" or "fluid medium" used herein description, any substance whose viscosity is to be understood, regardless of whether viscosity is determined as viscosity dynamic or as kinematic viscosity, allow an output of the substance of a container, if necessary by applying additional pressure Therefore, these concepts not only include substances that flow on their own, such as aqueous substances, but also substances that only flow when a pressure is applied, such as fatty substances and pasty.

According to a first preferred use, the closure is used for food, and in this case food belonging to a group that includes the following: vegetables and fruit and other drinks; seasoning sauces of all kinds, as soy sauce and the like; viscous condiments, such as mustard, ketchup, mayonnaise; viscous foods, such as honey, jellies, jams; dairy products, such as milk, condensed milk, cream and Similar.

The valve is also preferably used in the packaging of products for body care and cleaning, like liquid or pasty soap, shower gels, skin oils, sunscreen, shampoos, hair dyes, creams for skin, deodorants, etc.

The valve is also preferably used for other maintenance and cleaning products, such as detergents, universal cleaning materials, bitumen, polishing agents, Stain removers, liquid detergents and the like.

The closure is also preferably used for pharmaceutical products, and preferably for products used in small quantities, such as eye drops, drops nasal, disinfectants, and all forms of products pharmacists, regardless of whether they are designed to internal or external administration.

The use for technical products, for example for paints, lacquers, solvents, lubricants and other chemicals and substance mixtures techniques

Other advantages, features and possibilities of application of the present invention emerge from the description of embodiments in relation to the drawings.

The drawings show:

- Figure 1: A section through the closure of a container upside down, a first being arranged in the closure exemplary embodiment of an automatic shut-off valve according to the current state of the art.

- Figure 2: A view from below of the example of embodiment according to figure 1.

- Figure 3: The embodiment according to the Figure 1 in the open position.

- Figure 4: A plan view of the representation according to figure 3.

- Figure 5: A sectional representation of a Example of realization of a valve.

- Figure 6: A view from below of the valve according to figure 5, seen in the direction of the clamping ring.

- Figure 7: A sectional representation of a valve detail according to figure 5.

- Figure 8: A sectional representation of a exemplary embodiment of the valve according to the invention.

The closure shown in Figure 1 is designated in full with reference V. The closure is screwed into a neck 1 of a container 2 provided with a conventional thread. In the inside of this container, represented by the number of reference 3, is the designated fluid or medium symbolically with reference number 4, whose viscosity is choose in such a way that you can exit by a closure of the type in question. The wall of the container consists entirely or partially of a flexible material, which can be compressed by the user.

The neck 1 of the container 2 has a cylindrical configuration, the container may have a shape different. A closure cap is screwed onto neck 1 cylindrical 31 having a cylindrical part 32 provided with a internal thread corresponding to the external thread of neck 1.

It should be noted that it is not mandatory that the Cap can be screwed onto the neck of the container.  Other constructions can also be conceived, for example a closure cap fastened on the neck of the container by projections and fitted or fixed in an elastic way, or fixed any other way by friction, gluing or the like, on the neck of the container or on the container itself.

In this closure cap 31 a central opening 6 through which the medium 4 can flow.

The automatic shut-off valve, designated in in conjunction with reference number 5, prevents this flow of the medium Four.

The valve 5 has a membrane 7 which, when the valve is in the closed position, as shown in figure 1, it is bent inward as a segment spherical into the container 3 and the medium 4.

Attached to the membrane 7 is the wall of junction 8, which is also connected with clamping section 10 a through a zone of curvature 9. When mounted, this section clamping 10 is held by two cylindrical arms 11 formed in the cover area 12, which is essentially in the form of circular crown, of closure 31. The valve body consists of the membrane, the joint wall and the clamping section and is configured in one piece. The cover 12 is configured in such a way that the container can be kept upside down on the lid, and therefore on closure.

This type of conservation, or configuration corresponding technique that allows such conservation, It has the advantage that the space above the membrane always it is filled with liquid, so that, also in case of means viscous, for the extraction process it is not necessary that first flow the liquid to the valve.

As will be explained later, the membrane 7 it is not configured with a uniform wall thickness, but the wall thickness decreases towards the center.

In this embodiment, the wall itself junction 8 is clearly thinner than the membrane.

The connecting wall consists of part "a", which lies directly next to the membrane, and the part "b", which is linked with part "a" through the zone arched 9. In the closed position, zones "a" and "b" delimit an angle α of approximately 45 °, as indicated in figure 1.

In zone "b" of the intermediate wall is configured an annular flange 13 in one piece with the connecting wall,  protruding from it radially outward.

When the valve is open, as can be done observe in figure 3, the annular flange is supported by a shoulder 14 of an annular flange 15 protruding from the cap of the cap closing inwards and that is essentially configured with rotation symmetry

Highlight 14 is configured such that its tilt corresponds directly to the angle of the annular flange 13 in the open position.

The annular flange 15 widens conically out on the opposite side of the inside of the container 3, with which configures a guide that guides the "a" area of the wall intermediate during valve opening.

Additionally, but not represented in Figure 1, a folding cover can be provided that holds the membrane in the position shown in figure 1, for example with a hemispherical piece superimposed, and serve as safe during the transport.

The membrane 7 has grooves, as further described below with reference to figures 2 to 4.

The valve and the membrane are configured in set with rotation symmetry, corresponding to the axis of rotation in figure 1 to line A-A.

As can be seen in Figure 2, the membrane presents in total three slots that leave the point in the that the axis of rotation crosses the membrane, said point having the reference number 18.

The three slots are also arranged symmetrically and define each other an angle of 120º. The length of the grooves in relation to the membrane emerges from the representation of figure 1, according to which a slot occupies approximately an area between 3/5 and 4/5 of the membrane radius. The grooves are cut with a knife tool, being performed the cut preferably in the valve position shown in figure 1. The slots are then extended in a plane that is perpendicular to the cap 12 and that includes the axis of symmetry A-A.

All opening slots 16 have a total the same length, which in the representation according to figure 2 is formed by the partial lengths x + y + z.

In the exemplary embodiment, each slot it consists of an inner section II, which preferably represents more than half of the total length of the groove, to which it joins a bridge of uncut material 19. The slot then continues in section I. The first section II has the groove length "x", the material bridge has the groove length "y", and the slot that comes out of it has the length "z". Preferably, the bridge of material 19 and consequently the length "y" is somewhat smaller than length I.

This slot configuration has advantages considerable for opening and closing them.

As is known by the so-called theory of membranes, within an elastic membrane under load It forms a complex multiaxial tension state. The distribution of membrane tensions make it difficult to close this, since, in the case of a voltage component that generates a force in a direction not parallel to the corresponding groove, the individual lobes 20 defined by the grooves tend to overlap with their songs.

By means of material bridge 19 and later slot section I produces a defined voltage state that clearly favors lobe closure.

This takes place, on the one hand, because the bridge of material 19 is essentially subjected to a single single-axis tension perpendicular to the groove correspondent. Thus, when opening the individual lobes, the bridge of material 19 acts as a single tension spring which cannot generate any displacement force of the grooves with each other; it acts like an elastic rubber that expands with the opening of the lobes and, due to the force of recoil, tends to rejoin the lobes.

The slot section I behind of the bridge of material 19 reinforces this trend, given that it keeps tensions from the material bridge 19 perpendicular to the plane of the groove. This ensures that within the bridge of material 19 essentially only act forces perpendicular to the plane of the groove.

The operation of this closure, in particular with reference to figures 3 and 4.

If the user wishes to extract liquid from the container 2, open an existing lid if necessary (no represented in the figures), whereby the passage opening 6 of the closing cover is exposed.

Then hand squeeze the flexible walls of container 2, thereby creating an overpressure in the inside of the container This overpressure makes the section "b" of the junction wall "a" fold down and the ring flange 13 rely on shoulder 14. This process is very easy and safe to perform, since it consists of a movement of fold and does not require any rolling motion of the membrane.

Finally, the pressure is so great that it exceeds the elastic recoil forces of the membrane and the lobes are open outward, as shown in figure 4, which the opening O is formed.

The material then begins to flow through the opening O. The flow continues while the user continues to generate an overpressure inside the container by means of compression of the walls of this one.

When the user stops tightening the walls of the container, these widen, the pressure drops and the lobes are they close. The bridges of material 19 considerably facilitate the closing movement These bridges of material have large elastic recoil forces when the lobes move over the plane perpendicular to the axis of rotation symmetry A-A and cause a strong closure of the lobes, whose cutting surfaces are pressed against each other in the closing position, thereby configuring a secure closure. At closing process, due to the negative pressure prevailing in the container 3, even the material that is still in the opening area is absorbed into the container, so that on the outside of the lobes 20 no adhesion is adhered rest of the medium that could fall down. Especially through  the triangular configuration with three slots, the edges of the lobes 20 mold each other self-centering and prevent there is no opening in the area of the axis of rotation 18 (figure 2).

The effect of slot configuration used consists in particular of an increase in the strength of valve recoil, and regardless of the degree of ventilation, since the bridges of material 19, as already mentioned, they act like elastic bands that make the valve Return strongly to its original position. Thus, at the end of Each extraction, the valve closes completely again. The forecast of different parameters between the length of the sections I and II and the length of the material bridge 19 measured in that address is useful to be able to use the valve to different media For example, interrupting the bridges will further reduce the opening forces. In fact, just use bridges of rather narrow material. On the other hand, according to another configuration it is not necessary to interrupt the slots of opening if the recoil force is achieved simply by reducing the parameters x + y + z without this negatively influencing the opening forces In one case, the version presents the slots interrupted with the measures z, y, x. The measurements vary throughout of the entire diameter of the closing cover 7. According to another version, the opening slots 16 are not interrupted, but only they have different lengths, that is, the measure z + y + x varies throughout the diameter of the membrane 7.

As inferred from the foregoing, the configuration of the slots has an essential influence on the opening and closing capacity of the membrane.

The use of three slots has the advantage special that the slots can rest against each other self-centering shape The use of material bridges has the advantage of being able to generate elastic recoil forces through a single axis tension state.

The length of the grooves and the width of said material bridges, and also the amount of material bridges (two or more bridges of material can also be provided per slot), can be varied to adapt the opening behavior and Close to different media.

In a configuration with three, four, five or more slots, all slots can have the same length. This is preferable in case of a configuration with symmetry of rotation of the valve membrane and an arrangement with symmetry of rotation of the center point of a slot configuration in Star with three, four, five or more slots.

However, in case of a configuration of Star slots with three, four, five or more slots, the individual slots can have different lengths, thereby that the slot configuration itself has no symmetry of rotation. In addition, also in the case of a membrane configured with rotation symmetry, the slots can be arranged in such a way that the common point of all membrane grooves does not match with its axis of rotation. In a configuration with three, four, five or more slots you can also provide a Star configuration with slots of equal or different length, in which the angles between the individual slots are not same. For example, in case of four slots, these can be configured in such a way that with one of the adjacent slots define an angle> 90º and with the other adjacent groove define An angle <90º.

Finally, in the membrane you can also provide several grooves that are not joined together, so that in case of a pressure application on the membrane more form is formed of an opening O.

Through the shape of the bulging membrane towards in in the closed position, the cutting edges of the lobes 20 lean against each other in vaulted form, which large clamping forces occur. However, at the same time is enough the action of small forces to open the lobes inward by negative pressure, which favors suction of the medium back into the container.

The configuration of the slots with bridges of material in relation to a membrane with Three slots However, it should be noted that you can also make a corresponding slot configuration with bridges of material if there is only one slot present, which in this case is extends across the axis of rotation, but also if there is present four or five slots. In this case they also adapt each other correspondingly the length of the grooves and the bridges of material.

Figures 5, 6 and 7 show another valve of closing. This shut-off valve can be introduced similarly in a closing cap, as in the case of the valve shut-off according to figures 1-4. However, this valve closure presents some differences with respect to the valve closure of figures 1-4, which are explained in detail in continuation.

First of all it should be noted that the membrane configuration and in particular the different realizations of the slots are the same as in the case of the valve according to figures 1-4. Therefore it is not re-entered details regarding the configuration of the slots.

The designated valve in conjunction with the number of reference 50 has a clamping ring 51, a connecting wall 52 and a membrane designated in conjunction with the reference number 53.

The clamping ring 51 is configured with annular shape and has a conical bevel 51a in its perimeter Exterior.

The clamping ring 51 is attached in one piece with joint wall 52.

The clamping ring, the connecting wall and the membrane are configured with rotation symmetry, designating the axis of rotation with the reference number 55.

The clamping ring 51 is in a plane perpendicular to the axis of rotation 55.

The connecting wall 52 consists of a part annular front 52a that extends essentially therein plane than the clamping ring 51, that is also perpendicular to the axis of rotation 55 of the valve. In the part front of the connecting wall 52 is provided zone 52b which is extends upward curved at an obtuse angle (in the representation according to figure 5), that is, moving away from the interior of the container when the valve is placed on it.

Following this zone 52b curved towards above the junction wall 52 is the hinge part 56, which is then transformed into membrane 53 through an area of union 57.

View from the side of the container, the part of hinge 56 has a sharp notch 58 which, seen in section transverse, it is configured in the form of a trapeze.

The bottom wall 58a of this notch (the upper edge in the representation of figure 5) is relatively narrow in relation to the depth of the notch, advantageously corresponding to half, so especially advantageous between a third and a fifth, of the notch depth.

The shape of the membrane represented in the figure 5 is advantageous for closing operation. The junction zone 57 has a side wall next to the recess 58 extends essentially in a straight line and whose extension imaginary delimits with the axis 55 an acute angle preferably between 60 and 85º. Next to this side wall is a short arc segment whose main extension delimits with the axis 55 an obtuse angle of 140 to 170 °. The upper part of the area of connection 57 away from the notch 58 has a configuration essentially in the form of "S".

As can be seen in Figure 5, the zone junction 57 is not symmetrically arranged in side wall 60 of the membrane, but in Figure 5 it is displaced towards above, that is, away from the inside of the container.

In addition, the surface 61 of the membrane, which is Outwardly oriented, it has an essentially curvature continuous that preferably approximates a function quadratic

The opposite wall 62, which faces the inside the container, consists of a plate 62a shaped circular plate and a transition zone 62b that extends linearly in the cross-sectional representation and that delimits an acute angle with axis 55, to which the wall is attached lateral 60 already mentioned. The acute angle preferably oscillates between 40 and 80º, especially preferably between 50 and 60º.

Due to section settings transverse membrane walls described above, the thickness of the membrane increases continuously from its central point, by the one that passes the axis of rotation 55, towards the side wall.

The thickness of the membrane in the area in which the side wall 62a shaped like a circular plate, which configures a perpendicular plane the axis of rotation 55, is transformed into the zone conical 62b, whose cross section defines an acute angle with the axis of rotation 55 is approximately twice as large as the membrane thickness in the area of the axis of rotation. Wall outer side 60 of the membrane has a thickness that, measured parallel to the axis of rotation 55, corresponds approximately to 3 - 4 times the thickness of the membrane in the center.

Preferably, the membrane is made of a silicone material, but others also come into consideration plastic materials, such as thermoplastic elastomers, etc.

Experiments have shown that a membrane of a silicone material produced as described above, with a slot configuration as described in relation to figures 2 and 4, it presents properties Especially good with regard to opening and closing. A membrane configured in this way opens easily and with a relatively large opening diameter, the opening position with little overpressure, and closes so safe and tight as soon as the overpressure disappears, and also the residues of the medium that are in the area of the opening they are sucked back into the container during the closing process.

Another particularity of the configuration according to the Figure 6 consists of additional clamping ring 70. As can be seen in figure 6, this clamping ring has numerous openings 71 arranged in peripheral direction, whose cross section, as can be seen mainly in the Figure 5, widens down, that is, in the opposite direction to the contact area with the clamping section 51a of the valve represented in figure 5.

The clamping ring 70 consists of a material harder and less elastic plastic than the membrane material proper.

The valve according to figures 5 and 6 is produced from as follows:

First the ring is injection molded clamping 70 with the corresponding plastic material in a independent operation

Then the clamping ring is introduced into the injection mold of the valve body and, as in the embodiment example, in said mold material is injected silicone. In this process, the silicone material penetrates the openings 71.

The silicone material is coated during a prolonged period at the appropriate temperatures.

Once produced the valve body is they practice the grooves in the valve, as shown in the figure 2.

Then the valve is inserted into a closure cap similar to that shown in figure 1, which is configured so that it holds the clamping ring 70 of the corresponding mode

Figure 8 shows an exemplary embodiment of a shut-off valve according to the invention that can be introduced into a closing cap similar to the closing valve according to Figures 1 to 4. The operation and configuration of the membrane and in particular the grooves of this one are similar mainly to those already explained in the context of the description of Figures 1 to 4.

However, the valve according to figure 8 it presents some peculiarities that will be described to continuation.

The valve, which essentially extends with rotation symmetry with respect to axis 80, has a membrane 82 in which a connecting wall 84 is formed in one piece essentially arranged radially on the inside of the first clamping ring 86, which is joined in one piece with the junction wall 84 and also with membrane 82. The first ring of clamping 86 is in contact with a second clamping ring 88 which, when the valve is mounted, is arranged on the side of the first clamping ring 86 facing the container.

The membrane is configured as a segment Spherical hollow or its configuration approximates that shape. The joining lines that extend from the arranged points radially on the outside of the membrane 82 towards the center of curvature preferably open a cone whose opening angle it oscillates between 45 and 135º and that corresponds especially preferably at approximately 90 °. The membrane wall 82 It has a constant thickness at least for the most part. In the transition zone 90 between the membrane 82 and the junction wall elevations stand out 92 that extend in the direction of the interior of the container and which are configured primarily in tip.

As side or direction oriented direction contrary to the container the side or the direction oriented towards the axis 80 of the outer part of the container when the valve is mounted on a container. Correspondingly, the direction or side facing the inside the vessel in the direction of the axis 80 will be designated such as the direction or side facing inward of the container or as inner side, to simplify.

The annular elevation 92 is delimited mainly in the direction of axis 80 by a section whose component is a spherical surface and / or that joins a spherical surface, so that this section is slightly inclined outward with respect to the spherical end zone oriented to said section, so that the section defines a angle with the axis 80 which is more obtuse than the angle delimited by the tangents in the end zone of the spherical surface with said axis 80. On the side opposite the axis 80, the elevation 92 is bounded by a surface that essentially falls with a large inclination and that delimits an angle with the axis 80 that preferably it is less than 45º, especially preferably less than 10º. The outer valve surface extends in radial direction outward following said elevation 92 essentially curved, particularly curved in shape Wavy or "S" shaped. Following elevation 92 there is a notch 94 whose bottom oriented towards the container has a rounded configuration and to which it joins in radial direction outward a rounded edge 96 protruding towards the outside of the container. This flange 96 is joined radially outwardly a zone 98 configured as a plate, presenting the transition between flange 96 and the area in the form of Plate 98 an essentially curved configuration. The shaped area of plate 98 extends essentially perpendicular to the axis 80. This plate-shaped area joins radially towards outside a second plate-shaped zone that configures the first clamping ring 86, the limiting surface of these plate-shaped areas oriented towards the inside of the container essentially in the same plane and meeting the limitation surface of these areas in the form of a plate oriented towards the outside of the container essentially in different planes, in particular such that the first clamping ring 86 is more thicker than the plate-shaped area 98 of the junction wall 84.

The limiting surface of the first ring of clamp 86 oriented towards the inside of the container and also the surface area of the plate-shaped area of the wall of junction 84, which is also oriented towards the inside of the container, extend essentially perpendicular to the axis 80. Attached to the lower limitation surface of the annular zone 98 of the connecting wall 84 is an annular notch 100 arranged radially in the inner part facing the container, whose bottom area 102 is configured with a shape essentially rounded. The limiting surface 104 that is extends from the bottom area 102 of said recess 100 in direction towards axis 80 presents a convex configuration and in particular part of the membrane limitation surface 82 oriented towards the inside of the container.

The limiting surface 106 arranged more beyond the bottom area 102 of the recess 100 seen from the axis 80, which extends from the plate-shaped area 98 towards the bottom area 102 of the notch 100, also has a convex configuration, in particular at least similar to a spherical segment whose center of curvature is located in the direction opposite the container.

The connecting wall 84 is particularly more thin than the membrane 82.

The second clamping ring 88 configured in plate shape, is connected in the direction of the container with the first clamping ring 86 and preferably has a diameter exterior greater than that of the first clamping ring 96.

The valve is preferably configured from flat shape, so that the outside diameter of the valve is like at least twice as large, preferably at least three times larger, especially preferably at least five times larger and particularly preferably at least seven times larger, than the maximum thickness of the valve in the direction of axis 80, which is indicated schematically by the double arrow 108.

Preferably, the flange 96 is offset in radial direction with respect to the bottom area 102 of the notch 100.

Especially preferably, the area of bottom 102 of the notch 100 is arranged in radial direction between flange 96 and notch 94.

Preferably, the second clamping ring It is made of polypropylene or polyamide. The remaining part of the valve, or membrane 82, junction wall 84 and also the first clamping ring 86 and its transition zones are made preferably silicone or a thermoplastic elastomer.

In this context, the combination of silicone and polyamide materials or the combination of materials of a thermoplastic elastomer and polypropylene.

These materials or combinations of materials they are also preferred for other embodiments of the invention.

Claims (16)

1. Automatic shut-off valve for extraction of fluid media from a container with a convex membrane (82) whose convexity is oriented towards the fluid medium in the closed position and that at build up a pressure in the vessel bulges outward in an extraction position, a clamping section (86) through which the valve is held in said container, a connecting wall (84) disposed between this membrane (82) and said clamping section (86), a group of grooves (16) provided in the membrane (82) that opens in the extraction position, and said group of slots (16) being arranged of such that, with the deformation of the membrane (82) of the position closing to the extraction position caused by the pressure in the container, recoil forces build up inside the membrane elastic that, when the pressure is discharged, cause the recoil of the membrane from said extraction position to the position of close, and presenting the connecting wall (84) between said clamping section and the membrane (82) an annular section that is essentially arranged in a common plane with the clamping section (86) or in a plane parallel to it, and a transition zone being configured (90) between said junction wall (84) and the membrane (82) in such a way that the membrane and the joint wall are decoupled in terms of moments presenting the membrane (82) in section transverse a delimitation wall with continuous curvature upper and lower, said wall thickness being essentially constant in this area, characterized in that this wall thickness is greater than the wall thickness of the joint wall (84) whose radius of curvature is oriented outwardly with respect to the membrane (82). 2. Automatic shut-off valve according to claim 1, characterized in that the transition zone (90) between the joint wall (84) and the membrane (90) is configured as a hinge. 3. Automatic shut-off valve according to at least one of claims 1 and 2, characterized in that the membrane and the connecting wall (84) are essentially configured with rotational symmetry. 4. Automatic shut-off valve according to at least one of claims 1 to 3, characterized in that the group of slots (16) is configured in such a way that it has a single groove (16 '). 5. Automatic shut-off valve according to at least one of claims 1 to 3, characterized in that said group of slots (16) has three slots (16 ') that are preferably star-shaped and preferably have the same distance in each case angular to each other. 6. Automatic shut-off valve according to at least one of claims 1 to 3, characterized in that said group of grooves has four, five or more grooves (16 ') that are preferably star-shaped and preferably in each case have the same angular distance from each other. 7. Automatic shut-off valve according to claim 3 and one of claims 4 to 6, characterized in that said group of slots (16) is configured with rotation symmetry with respect to the axis of rotation. 8. Automatic shut-off valve according to at least one of claims 4 to 7, characterized in that at least one of these slots (16 ') is interrupted such that a bridge of material is formed, the length of this slot interruption being (19) smaller, preferably considerably less, than the total length of the corresponding slot (16). 9. Automatic shut-off valve according to at least one of claims 4 to 8, characterized in that at least one slot has at least two or more interruptions. 10. Automatic shut-off valve according to at least one of claims 1 to 9, characterized in that a reinforcement ring (88) provided in the area of the clamping section (51), ring which is made of a plastic material harder than the membrane material. 11. Automatic shut-off valve according to claim 10, characterized in that in the case of a valve body with rotational symmetry said reinforcement ring (88) is configured with rotational symmetry and has numerous openings in which section material is found clamping (51) when the valve is fully assembled. 12. Automatic shut-off valve according to at least one of claims 1 to 11, characterized in that the valve body is made of a silicone material. 13. Automatic shut-off valve according to at least one of claims 1 to 11, characterized in that the valve body is made of a thermoplastic elastomer. 14. Automatic shut-off valve according to one of the preceding claims, characterized in that the valve is made of thermoplastic and polypropylene elastomer or of silicone and polyamide. 15. Automatic shut-off valve according to one of the preceding claims, characterized in that the membrane (82) is shaped as a hollow spherical segment. 16. Automatic shut-off valve according to at least one of the preceding claims, characterized in that the diameter of the valve is at least twice the thickness of the valve.